Buyers should prioritize Brushless Motors, which offer 50% longer runtime and increased durability compared to brushed versions. Key metrics include Max Torque (measured in Nm or ft-lbs)—ensure it meets your specific application (e.g., 300Nm for automotive, 1000Nm+ for heavy machinery). Additionally, verify the Impact Rate (IPM) and No-Load Speed (RPM) to ensure efficiency. For battery systems, Lithium-ion (Li-ion) technology with at least 4.0Ah capacity is the industry standard for professional use.